Sains Malaysiana 40(5)(2011): 425–430
Application of Spectral Analysis of Surface Waves (SASW) Method: Rock Mass Characterization
(Aplikasi Kaedah Analisis Spektral Gelombang Permukaan (SASW): Pencirian Jasad Batuan)
T. L. Goh*, Abdul Rahim Samsudin
& Abdul Ghani Rafek
Geology
Programme, School of Environmental and Natural Resource Sciences
Faculty
of Science and Technology, Universiti Kebangsaan Malaysia
43600
UKM Bangi, Selangor D.E., Malaysia
Diserahkan:
5 Januari 2010 / Diterima: 19 Mei 2010
ABSTRACT
A geotechnical study needs to be carried out to determine the
engineering parameters of the rock mass at the project site in executing
construction projects such as tunnels, dams, highways and buildings. Design and
safety factor of the construction are highly dependent on soil and rock
engineering parameters which are usually determined by in-situ test such as
Standard Penetration Test (SPT) and seismic tests. The SPT test
which normally involves drilling and laboratory works always incur high operating
cost, while seismic tests on the other hand are fast, cheap, non-destructive
and an easy to operate method for rock mass characterization. The spectral
analysis of surface waves (SASW) method is an in situ and
non-destructive measurement that is rapid and cost effective. The aims of this
study were to determine Rock Quality Designation (RQD)
value, excavation classification analysis as well as site characterization by
using the SASW method. WinSASW 3.1.3 was used for inversion
processing of the SASW data to produce shear wave
velocity (Vs) versus depth profiles. The profiles were then analyzed and
correlated with rock mass engineering geological parameters such as RQD and
site characterization as well as excavation classification of rock mass. Twenty
(20) SASW tests were conducted on the granitic rock mass and
four (4) SASW tests were conducted on a cut hill slope of
metasedimentary rocks. RQD values were computed based on
shear wave velocities and ultrasonic velocities of intact (fresh) rock. The
differences between RQD obtained from SASW method
and those from discontinuity survey were found to be less than 10%. Excavation
classification for granitic rock mass at JKR Quarry was empirically
determined using both SASW and ultrasonic velocities as well
as RQD value of the rock mass. Site characterization for
metasedimentary rocks mass at Bukit Tampoi was determined based on shear wave
velocities from SASW method.
Keywords:
Excavation classification; rock quality designation; SASW method; site characterization
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*Pengarang untuk
surat-menyurat; email: gdsbgoh@gmail.com
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